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Anomalous-dispersion phase-matched second-harmonic generation.

P A Cahill, K D Singer, L A King

    Optics Letters
    |September 16, 2009
    PubMed
    Summary
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    Researchers achieved anomalous-dispersion phase-matched second-harmonic generation using electric-field-induced second-harmonic generation in a Foron Brilliant Blue S-R dye solution. This confirms the two-state model for second-order hyperpolarizability.

    Area of Science:

    • Nonlinear Optics
    • Materials Science
    • Dye Chemistry

    Background:

    • Second-harmonic generation (SHG) is crucial for frequency conversion in optics.
    • Anomalous dispersion in nonlinear optical materials can enhance SHG efficiency.
    • Electric-field-induced SHG (EFISHG) is a technique to measure molecular hyperpolarizability.

    Purpose of the Study:

    • To demonstrate anomalous-dispersion phase-matched SHG.
    • To investigate the nonlinear optical properties of Foron Brilliant Blue S-R (FBB) dye.
    • To validate the two-state model for second-order hyperpolarizability.

    Main Methods:

    • Utilized electric-field-induced second-harmonic generation (EFISHG) in a liquid solution of FBB.
    • Measured the microscopic hyperpolarizability (beta) of FBB at two different wavelengths (1.58 and 0.954 microm).

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  • Analyzed the sign change of beta and its frequency independence.

    • Main Results:

    • Successfully demonstrated anomalous-dispersion phase-matched SHG.
    • Measured beta values of 163 x 10(-30) cm(5)/esu at 1.58 microm and -118 x 10(-30) cm(5)/esu at 0.954 microm.
    • Observed a sign change in beta consistent with the two-state model.

    Conclusions:

    • The observed sign change and frequency independence of beta support the two-state model.
    • FBB is a suitable material for achieving anomalous-dispersion phase-matched SHG.
    • This work provides insights into molecular hyperpolarizability and nonlinear optical phenomena.